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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 1,178 $ 1,298
Fair Value, Less Than Twelve Months 80,103 164,797
Gross Unrealized Losses, Twelve Months or More 7,505 2,920
Fair Value, Twelve Months or More 229,996 104,610
Total Unrealized Losses $ 8,683 $ 4,218
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 66 81
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 102 24
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 168 105
Government sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 $ 1
Fair Value, Less Than Twelve Months 0 216
Gross Unrealized Losses, Twelve Months or More 2 0
Fair Value, Twelve Months or More 170 0
Total Unrealized Losses 2 1
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 83 142
Fair Value, Less Than Twelve Months 14,732 16,139
Gross Unrealized Losses, Twelve Months or More 168 1
Fair Value, Twelve Months or More 15,090 188
Total Unrealized Losses 251 143
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 646 151
Fair Value, Twelve Months or More 2,554 3,049
Total Unrealized Losses 646 151
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 896 454
Fair Value, Less Than Twelve Months 43,485 72,007
Gross Unrealized Losses, Twelve Months or More 4,384 1,896
Fair Value, Twelve Months or More 124,253 76,065
Total Unrealized Losses 5,280 2,350
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 199 701
Fair Value, Less Than Twelve Months 21,886 76,435
Gross Unrealized Losses, Twelve Months or More 2,305 872
Fair Value, Twelve Months or More 87,929 25,308
Total Unrealized Losses $ 2,504 $ 1,573